Primer generation-rolling circle amplification method optimized for the detection of pathogenic bacteria

IF 2.5 4区 生物学 Q3 BIOTECHNOLOGY & APPLIED MICROBIOLOGY
Eun-Jin Jang, Tai-Yong Kim, Jeong-A. Lim, Min-Ah Woo
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Abstract

With advancements in DNA amplification research, isothermal amplification technology has emerged as an attractive method for detecting target DNA. Here, we describe primer generation-rolling circle amplification (PG-RCA) as an isothermal amplification method for detecting Escherichia coli O157:H7, Salmonella Typhimurium, Bacillus cereus, and Listeria monocytogenes. To improve PG-RCA sensitivity, the concentrations of the reaction components, dNTPs, phi29 DNA polymerase, and circular probes were optimized; the optimized conditions were applied to detect each target bacterium. A pair of forward and reverse circular probes that hybridized to the sense and anti-sense target genes was used in PG-RCA, exhibiting target selectivity. PG-RCA, which generated additional primers simultaneously with linear RCA and comprised multiple reaction cycles, resulted in higher accumulation of amplified DNA products than did linear RCA within the same reaction period. The threshold time (Tt) for each target gene concentration was determined based on the threshold value set in the amplification plot for PG-RCA, and a linear correlation between the Tt value and genomic DNA concentration was proven for each of the four bacteria. The PG-RCA-based assay could be applied to gene-based detection of various microorganisms and may be a useful isothermal amplification method for replacing traditional PCR methods.

Abstract Image

用于检测病原菌的引物生成-滚动圈扩增优化方法
随着 DNA 扩增研究的发展,等温扩增技术已成为检测目标 DNA 的一种极具吸引力的方法。本文介绍了引物生成-滚圆扩增(PG-RCA)作为一种等温扩增方法,用于检测大肠杆菌 O157:H7、鼠伤寒沙门氏菌、蜡样芽孢杆菌和单核细胞增生李斯特菌。为了提高 PG-RCA 的灵敏度,对反应成分、dNTPs、phi29 DNA 聚合酶和环状探针的浓度进行了优化;优化后的条件用于检测每种目标细菌。在 PG-RCA 中使用了一对与正义和反义目标基因杂交的正反圆探针,表现出目标选择性。PG-RCA 与线性 RCA 同时产生额外的引物,包括多个反应循环,在相同的反应时间内,扩增 DNA 产物的累积量高于线性 RCA。根据 PG-RCA 扩增图中设定的阈值,确定了每种目标基因浓度的阈值时间(Tt),并证明四种细菌的 Tt 值与基因组 DNA 浓度呈线性相关。基于 PG-RCA 的检测方法可应用于基于基因的各种微生物检测,可能是替代传统 PCR 方法的一种有用的等温扩增方法。
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来源期刊
Biotechnology and Bioprocess Engineering
Biotechnology and Bioprocess Engineering 工程技术-生物工程与应用微生物
CiteScore
5.00
自引率
12.50%
发文量
79
审稿时长
3 months
期刊介绍: Biotechnology and Bioprocess Engineering is an international bimonthly journal published by the Korean Society for Biotechnology and Bioengineering. BBE is devoted to the advancement in science and technology in the wide area of biotechnology, bioengineering, and (bio)medical engineering. This includes but is not limited to applied molecular and cell biology, engineered biocatalysis and biotransformation, metabolic engineering and systems biology, bioseparation and bioprocess engineering, cell culture technology, environmental and food biotechnology, pharmaceutics and biopharmaceutics, biomaterials engineering, nanobiotechnology, and biosensor and bioelectronics.
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